So I first ordered the sample kit and got the kit to try and I went through it so fast it was unbelievable out of the 100s of cartridges I have made already I haven't had a single complaint and the liquidizer is easy to use also I have made mixtures with the different flavors such as strawberry banana they all mix very well together... 100s of people can't be wrong this is def the greatest product of it's kind on the market highly recommended I have now upgraded to purchasing a couple of the 60ml bottles at a time great buy greatest way to use your concentrates anywhere without anyone knowing..